server.js

const mongoose = require('mongoose');
const dotenv = require('dotenv');

process.on('uncaughtException', (err) => {
  console.log('Uncaught Exception, Shutting down the server.....');
  console.log(`${err.name}: ${err.message}`);
  process.exit(1);
});

dotenv.config({ path: './config.env' });
const app = require('./app');

const DB = process.env.DATABASE.replace(
  '<PASSWORD>',
  process.env.DATABASE_PASSWORD
);

mongoose.set('strictQuery', true);

mongoose
  .connect(DB, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => {
    console.log('Connection Established');
  });

const port = process.env.PORT || 3000;
const server = app.listen(port, () => {
  console.log(`App is running on port ${port}...`);
});

process.on('unhandledRejection', (err) => {
  console.log('Unhandled Rejection, Shutting down the server.....');
  console.log(`${err.name}: ${err.message}`);
  server.close(() => {
    process.exit(1);
  });
});